Allow user to specify mode for pub build/serve.

sdk/lib/_internal/pub/test/transformer/dart2js/unminified_by_default_test.dart

Index: sdk/lib/_internal/pub/test/transformer/dart2js/unminified_by_default_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/unminified_by_default_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/unminified_by_default_test.dart
deleted file mode 100644
index 1fc312c4fc6c9cc096368a5933fe764cfb34957f..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/transformer/dart2js/unminified_by_default_test.dart
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library pub_tests;
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-import '../../serve/utils.dart';
-
-main() {
-  initConfig();
-  integration("generates unminified JS by default", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.file("main.dart", "void main() => print('hello');")
-      ])
-    ]).create();
-
-    pubServe();
-    requestShouldSucceed("main.dart.js", isUnminifiedDart2JSOutput);
-    endPubServe();
-  });
-}